New Posts New Posts RSS Feed - BC (ballistic coefficients) don't bet on it
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Check GunBroker.com for SWFA's No Reserve and No Minimum bid firearm auctions.

BC (ballistic coefficients) don't bet on it

 Post Reply Post Reply   Topic Search Topic Search  Topic Options Topic Options
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/08/2012 at 13:22
cruft View Drop Down
Optics Apprentice
Optics Apprentice


Joined: November/20/2005
Status: Offline
Points: 88
The latest issue of Varmint Hunters magazine has  an article comparing BC of bullet manufactures against real world testing.  This is an almost impossible task when you think about it.  Just think of the variables.  OK now sit down and take a deep breath.  So now that you head is spinning the author did, in a small universe, make a case.  Results; Sierra and Hornady good, Nosler yuck.  You just can let the marketers have any say so.  But more than that, and the reason this is here under "varmint scopes, is that MPBR is not viable for small targets (vial areas) after 250 yes and less.  This is not the case for large with a vital area of 10".  The long distance of 500 yds the BDC reticle just runs out of usefulness.  I don't know the reality of the Horus reticle, being that a small compute at the site and need of SFP are required.  Hopefully one of you will advise.  AnywayLike the Book of James ZI started on one topic and wandered into another.  Moral Don't believe manufacturer's numbers, but who didn't know that.  Oh and we still need clicks.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/08/2012 at 13:44
Bitterroot Bulls View Drop Down
Optics Master Extraordinaire
Optics Master Extraordinaire
Avatar

Joined: May/07/2009
Location: Montana
Status: Offline
Points: 3382
The specific rifling grooves on the prjectile from specific rifles also affect BC.  I find my own BCs by using a ballistic calculator and shooting through chronographs at 10 feet and 200 yards.
 
I am usually just under Nosler's published BCs and just over Barnes' BCs.
 
Berger's are very close.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/08/2012 at 16:27
Dale Clifford View Drop Down
Optics Jedi Knight
Optics Jedi Knight


Joined: July/04/2004
Location: United States
Status: Offline
Points: 5087
JBM internet program gives good bc if you use the Litz option, which will also give you spin drift. Most programs give calculated bc from some type of on going correction to the g1 as it decreases in velocity. Snipershide has an ongoing discussion as to bc and point mass changes and their effects in the marksmanship section. Patagonia does not believe these systems are accurate and uses drag functions based on velocities at different distances, then uses curve fitting techniques to find the actual drops. What does this all mean to the ave. shooter. Not much if they aren't chronographing and using sd and spread.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/08/2012 at 21:07
jonoMT View Drop Down
Optics Master Extraordinaire
Optics Master Extraordinaire
Avatar

Joined: November/13/2008
Location: Montana
Status: Offline
Points: 4618
Litz details in his book, Applied Ballistics for Longrange Shooting, the tests they did on a variety of popular bullets. I only use one Nosler bullet, which is the .308 165 gr. Accubond, and it did have a lower BC - verified by my own shooting. I still find it to be a great bullet for hunting elk, deer and antelope, but wish Nosler's figure had just been more accurate in the first place.
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Similar Threads: "BC (ballistic coefficients) don't bet on it"
Subject Author Forum Replies Last Post
Ballistic Coefficient for Silver Bear 223 62gr HP Beiruty Shooting 3
Swaro Z-5, Ballistic(BRX - Verses Ballistic Turret JF4545 Rifle Scopes 10
Best Bet in the $600 range BOATBUM101 Binoculars 9 7/24/2004 10:28:09 AM
Sightron S2 Big Sky 3.5-10x50, BC flipups - $325 s greywolf Optics For Sale 4
IOR Valdada ballistic calculator kickin45 Reloading & Ballistics 3
High BC bullets? trigger29 Reloading & Ballistics 11
Calculating barrel twist rate and BC 8shots Firearms 1
Can someone help me out with BC flip ups Boomholzer Rifle Scopes 2 11/10/2004 11:00:06 AM
Leica BN, BA, BC and HDC ? Stephanie Binoculars 3 6/28/2005 9:23:43 AM
FS Weaver 1-3x20, rings, BC flips greywolf Optics For Sale 2


This page was generated in 0.359 seconds.